using Microsoft.Data.SqlClient;

namespace ScadaLink.CentralUI.PlaywrightTests.Audit;

/// <summary>
/// Direct-SQL seeding helper for the Audit Log Playwright E2E tests (#23 M7-T16).
///
/// <para>
/// The Playwright suite runs against the live Docker cluster (the same one that
/// answers <c>http://localhost:9000</c>), which talks to the <c>ScadaLinkConfig</c>
/// database on <c>localhost:1433</c>. <c>infra/mssql/seed-config.sql</c> is off
/// limits per the task's strict rules, so each test inserts its own
/// <c>AuditLog</c> rows at setup time and best-effort deletes them at teardown.
/// </para>
///
/// <para>
/// Rows are tagged with a unique <c>Target</c> prefix derived from the test
/// name + a GUID so the teardown <c>DELETE</c> never touches rows the cluster
/// itself produced. The <c>OccurredAtUtc</c> is pinned to "now" so the default
/// <see cref="ScadaLink.CentralUI.Components.Audit.AuditTimeRangePreset.LastHour"/>
/// time-range filter still sees the row after Apply.
/// </para>
///
/// <para>
/// Connection string mirrors the Docker cluster's <c>scadalink_app</c> account
/// from <c>docker/central-node-a/appsettings.Central.json</c>, with the host
/// pointed at the host-exposed port (<c>localhost:1433</c>). The
/// <c>SCADALINK_PLAYWRIGHT_DB</c> env var lets CI override the connection
/// without recompiling.
/// </para>
/// </summary>
internal static class AuditDataSeeder
{
    private const string DefaultConnectionString =
        "Server=localhost,1433;Database=ScadaLinkConfig;User Id=scadalink_app;Password=ScadaLink_Dev1#;TrustServerCertificate=true;Encrypt=false;Connect Timeout=5";

    private const string EnvVar = "SCADALINK_PLAYWRIGHT_DB";

    /// <summary>
    /// Connection string for the running cluster's configuration DB. Resolved
    /// from <c>SCADALINK_PLAYWRIGHT_DB</c> when set, otherwise the local docker
    /// dev defaults.
    /// </summary>
    public static string ConnectionString
    {
        get
        {
            var fromEnv = Environment.GetEnvironmentVariable(EnvVar);
            return string.IsNullOrWhiteSpace(fromEnv) ? DefaultConnectionString : fromEnv;
        }
    }

    /// <summary>
    /// Inserts a single audit row into <c>AuditLog</c>. All optional fields are
    /// nullable so individual tests can shape the row to whatever payload they
    /// need for their drawer/grid assertions.
    /// </summary>
    public static async Task InsertAuditEventAsync(
        Guid eventId,
        DateTime occurredAtUtc,
        string channel,
        string kind,
        string status,
        string? sourceSiteId = null,
        string? target = null,
        string? actor = null,
        Guid? correlationId = null,
        Guid? executionId = null,
        int? httpStatus = null,
        int? durationMs = null,
        string? errorMessage = null,
        string? requestSummary = null,
        string? responseSummary = null,
        string? extra = null,
        CancellationToken ct = default)
    {
        const string sql = @"
INSERT INTO [AuditLog]
([EventId], [OccurredAtUtc], [IngestedAtUtc], [Channel], [Kind], [CorrelationId],
 [ExecutionId], [SourceSiteId], [SourceInstanceId], [SourceScript], [Actor], [Target],
 [Status], [HttpStatus], [DurationMs], [ErrorMessage], [ErrorDetail], [RequestSummary],
 [ResponseSummary], [PayloadTruncated], [Extra], [ForwardState])
VALUES
(@eventId, @occurredAtUtc, SYSUTCDATETIME(), @channel, @kind, @correlationId,
 @executionId, @sourceSiteId, NULL, NULL, @actor, @target,
 @status, @httpStatus, @durationMs, @errorMessage, NULL, @requestSummary,
 @responseSummary, 0, @extra, NULL);";

        await using var connection = new SqlConnection(ConnectionString);
        await connection.OpenAsync(ct);
        await using var cmd = connection.CreateCommand();
        cmd.CommandText = sql;
        cmd.Parameters.AddWithValue("@eventId", eventId);
        cmd.Parameters.AddWithValue("@occurredAtUtc", occurredAtUtc);
        cmd.Parameters.AddWithValue("@channel", channel);
        cmd.Parameters.AddWithValue("@kind", kind);
        cmd.Parameters.AddWithValue("@correlationId", (object?)correlationId ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@executionId", (object?)executionId ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@sourceSiteId", (object?)sourceSiteId ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@actor", (object?)actor ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@target", (object?)target ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@status", status);
        cmd.Parameters.AddWithValue("@httpStatus", (object?)httpStatus ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@durationMs", (object?)durationMs ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@errorMessage", (object?)errorMessage ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@requestSummary", (object?)requestSummary ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@responseSummary", (object?)responseSummary ?? DBNull.Value);
        cmd.Parameters.AddWithValue("@extra", (object?)extra ?? DBNull.Value);

        await cmd.ExecuteNonQueryAsync(ct);
    }

    /// <summary>
    /// Best-effort cleanup. Deletes every <c>AuditLog</c> row whose <c>Target</c>
    /// starts with <paramref name="targetPrefix"/>. Swallows all errors — a
    /// stuck row carrying a random GUID suffix does not collide with future
    /// runs and tests should not fail teardown.
    /// </summary>
    public static async Task DeleteByTargetPrefixAsync(string targetPrefix, CancellationToken ct = default)
    {
        try
        {
            await using var connection = new SqlConnection(ConnectionString);
            await connection.OpenAsync(ct);
            await using var cmd = connection.CreateCommand();
            cmd.CommandText = "DELETE FROM [AuditLog] WHERE [Target] LIKE @prefix";
            cmd.Parameters.AddWithValue("@prefix", targetPrefix + "%");
            await cmd.ExecuteNonQueryAsync(ct);
        }
        catch
        {
            // Best-effort — the prefix carries a GUID so the rows are unique to
            // this test run and won't collide on the next pass.
        }
    }

    /// <summary>
    /// Probe whether the configuration DB is reachable. Tests gate their
    /// per-test setup on this; when the cluster is down the test fails with a
    /// clear "MSSQL unavailable" message instead of an opaque SqlException.
    /// </summary>
    public static async Task<bool> IsAvailableAsync(CancellationToken ct = default)
    {
        try
        {
            await using var connection = new SqlConnection(ConnectionString);
            await connection.OpenAsync(ct);
            return true;
        }
        catch
        {
            return false;
        }
    }
}